Scissor ladder



FIG. 1 is a front perspective view of the scissor ladder;

FIG. 2 is a left side view of the scissor ladder;

FIG. 3 is a right side view of the scissor ladder;

FIG. 4 is a top view of the scissor ladder;

FIG. 5 is a bottom view of the scissor ladder;

FIG. 6 is a front view of the scissor ladder;

FIG. 7 is a rear view of the scissor ladder; and,

FIG. 8 is a front perspective view of the scissor ladder leaning against a tree, which tree is shown in broken lines and does not form a part of the claimed design.

The broken line showing of various portions of the scissor ladder in FIGS. 1-8 and of the tree in FIG. 8 forms no part of the claimed design. 

The ornamental design for a scissor ladder, as shown and described. 